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Python Collections and comprehensions

Python Collections and comprehensions Quiz

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Question 1

What is the primary advantage of using list comprehension over traditional loops in Python?

List comprehension is more memory-efficient.
List comprehension is faster.
List comprehension allows complex logic.
List comprehension supports parallel processing.

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Question 2

When using list comprehension, what happens if the iterable is empty?

It raises a ValueError.
It creates an empty list.
It raises a SyntaxError.
It results in an infinite loop.

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Question 3

What is the main purpose of the Counter class in the collections module?

To store key-value pairs in order
To count the occurrences of elements in an iterable
To merge multiple dictionaries into one
To create a dictionary that prevents deletions

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Question 4

Which statement is true about an OrderedDict?

It does not maintain the order of elements
It raises a KeyError if a missing key is accessed
It remembers the order in which keys were inserted
It allows only numerical keys

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Question 5

What happens when you try to access a missing key in a defaultdict?

It returns None
It raises a KeyError
It removes the key from the dictionary
It returns the default value set for the dictionary

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Question 6

What is the purpose of the ChainMap class in the collections module?

It chains multiple dictionaries into a single unit
It ensures all keys in a dictionary are unique
It provides a way to count elements in a sequence
It maintains the insertion order of keys

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Question 7

Output of given code is

Python

from collections import deque
queue = deque(['name','age','DOB'])
print(queue)

['name', 'age', 'DOB']
deque(['name', 'age'])
deque['name', 'age', 'DOB']
deque(['name', 'age', 'DOB'])

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Question 8

Deque in Python is implemented using the module __________

collections
collect
dequeue
collection

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Question 9

What is the purpose of the following list comprehension?

words = ['python', 'list', 'comprehension']
unique_starting_letters = {word[0].upper() for word in words}

Creates a list of unique starting letters of words.
Creates a set of unique starting letters of words.
Creates a dictionary with starting letters as keys and words as values.
Counts the occurrences of each starting letter.

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Question 10

Explain the term "nested list comprehension."

It refers to using multiple conditions in a single list comprehension.
It involves using a list comprehension inside another list comprehension.
It is a type of list comprehension specific to nested lists.
It is an advanced feature not related to list comprehensions.

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Python

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